Method for treating nutrient substances in excess sludge and special high-voltage alternating-current pulse sludge decomposition device

Abstract

The invention belongs to methods and equipment for treating sludge and particularly relates to a method for treating nutrient substances in excess sludge and a special high-voltage alternating-current pulse sludge decomposition device. The nutrient substances in the excess sludge are treated through the technological steps of thermal refining, sludge wall or film breaking, mud and water separation, injection of supernate into a biochemical system and the like. The high-voltage alternating-current pulse sludge decomposition device comprises a sludge flowing pipe, connection flanges arranged at the two ends of the sludge flowing pipe, a sludge inlet, a sludge outlet, electrodes arranged in the sludge flowing pipe, and a power source electrically connected with the electrodes, wherein the sludge inlet and the sludge outlet are formed in the front part and the rear part of the sludge flowing pipe. The number of the electrodes is at least two, the electrodes are evenly distributed in the sludge flowing pipe, and a high-voltage alternating-current pulse power source is selected as the power source. The method for treating the nutrient substances in the excess sludge and the special high-voltage alternating-current pulse sludge decomposition device solve the problems that in the prior art, an additional carbon source exists, a large amount of manpower and material resources are needed, the operation burden and cost of a sewage plant is aggravated, the reagent dosage is large, and operation is complex. The method for treating the nutrient substances in the excess sludge and the special high-voltage alternating-current pulse sludge decomposition device have the advantages that energy consumption is low, the sludge treating effect is good, and the carbon source dosage is small.

Description

technical field [0001] The invention belongs to a sludge treatment method and equipment, in particular to a treatment method for nutrients in excess sludge and a special high-voltage AC pulse sludge decomposition device. Background technique [0002] As of 2013, the number of sewage treatment plants above the county level in my country has reached more than 3,500, accompanied by a large amount of excess sludge. The sludge output will reach 60 million tons. If such a large amount of surplus sludge is not properly disposed of, it will cause serious secondary pollution to the environment. In addition, studies have found that the residual sludge contains many useful substances, such as nucleic acids, proteins, polysaccharides, etc., which will be expressed in the form of dissolved COD. If such soluble COD can be extracted, precipitated and reused from sludge, the sludge can be turned into a resource and an energy source, and at the same time, the problem of disposal of a large a...

AI Technical Summary

Problems solved by technology

However, there is only one electrode body in the sludge flow pipe of the device. To improve the treatment efficiency, multiple sludge flow pipes must be connected in series, which results in a small contact area between the internal electrodes and the sludge, low sludge crushing efficiency, and The floor area and energy consumption of the equipment are increased; the sludge treatment device is used in conjunction with the alkali treatment equipment, and there are disadvantages such as large dosage of chemicals and complicated operation.

[0006] The utility model patent with the patent number of 201220169568.2 discloses a sewage treatment device that uses self-generating sludge for carbon source development and application. The ozone generator is installed in the broken-wall sludge return pipeline from the secondary sedimentation tank to the biochemical tank. The strong oxidation of ozone destroys microbial cells, releases intracellular organic matter, and supplements carbon sources for biological denitrification and phosphorus removal, but there are also some problems. One is that the remaining ozone will strongly kill microorganisms in the biochemical treatment system The inhibitory effect will directly affect its treatment effect on wastewater. The ozone generator consumes a lot of energy, which will also increase the operating cost of the sewage plant; Utilization and refractory biodegradable substances enter together, increasing the load on the biochemical system

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